US2558982A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Film advancing and guiding means in microfilm projectors
Assignee: Individual
•
Filing: 1945-03-07
•
Granted: 1951-07-03
•
Expires: 1965-03-07
Abstract
No abstract record available.
Inventors
- 👤 Verneur E Pratt
- 👤 George F Gray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:05
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/10; G03B21/11
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1082678A
Cited
US1304565A
Cited
US1297532A
Cited
US1256613A
Cited
US1489510A
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US1455367A
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US1808274A
Cited
US1827206A
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US1894004A
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US1991870A
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US1933783A
Cited
GB382860A
Cited
US2081329A
Cited
US2142606A
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FR818632A
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US2177638A
Cited
FR836659A
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US2115014A
Cited
US2181133A
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US2265992A
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US2195699A
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US2303518A
Cited
US2256396A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-07-02 | 1955-01-01 | 1955-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-02 | 1959-01-01 | 1959-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-02 | 1963-01-01 | 1963-07-03 | $7700.00 | Window Closed / Lapsed |